Delta MH300 Series - Page 821

Chapter 14 Fault CodesMH300
14-94
ID No. Display Fault Name Description
134
Internal
communication error
(EoL3)
Electronic thermal relay 3 protection. The drive
coasts to stop once it activates.
Action and Reset
Action condition Start counting when output current > 105% of the motor 3 rated current.
Action time
Pr.14-81 (If the output current is larger than 105% of the motor 3 rated
current again within 60 sec., the counting time reduces and is less than
Pr.14-81)
Fault treatment parameter N/A
Reset method Manual reset
Reset condition Reset in five seconds after the fault is cleared
Record Yes
Cause Corrective Actions
The load is too large Reduce the load.
Accel. / Decel. time or the
working cycle are too short
Increase the setting value for Pr.01-12–01-19 (accel. / decel. time)
V/F voltage is too high
Adjust the settings for Pr.01-54–01-61 (V/F curve), especially the setting
value for the mid-point voltage (if the mid-
point voltage is set too low, the
load capacity decreases at low speed).
Overload during low-speed
operation.
When using a general motor,
even it operates below rated
current, an overload may still
occur during low-speed
operation.
Decrease low-speed operation time.
Replace the drive with a dedicated to VFD model.
Increase the motor capacity.
When using VFD dedicated
motor, Pr.06-13=0 (electronic
thermal relay selection motor 1
= inverter motor)
Pr.14-80 = 1 electronic thermal relay selection motor 1 = standard motor
(motor with fan on the shaft).
Incorrect value of electronic
thermal relay
Reset to the correct motor rated current.
The maximum motor frequency
is set too low
Reset to the correct motor rated frequency.
One drive to multiple motors
Set Pr.14-80 electronic thermal relay 3 selection = 2 disable, and install
thermal relay on each motor.
Check if the setting for stall
prevention is correct.
Set the stall prevention to the proper value.
Torque compensation is too
large
Adjust the torque compensation (refer to Pr.07-73 torque compensation
gain) until the current reduces and the motor does not stall.